Fuse plug



Oct. 20, 1925. 1.5 3

A. GOEMANN FUSE PLUG Filed Dec. 22, 1924 Patented Oct. 20, 1925.

UNITED STATES PATENT OFFICE.

ANTON GOEIANN, OF BALTIMORE, MARYLAND, ASSIGNOR OF ONE-HALF TO PAUL A.

BOKEL, BALTIMORE, MARYLAND.

FUSE PLUG.

Application filed December 22, 1924. Serial No. 757,430.

To all 7.0/1 om it may concern Be it known that I, ANTON GOEMANN, a citizen of the German Republic, residing at Baltimore, in the State of Maryland, have invented a new and useful Improvement in Fuse Plugs, of which the following is a specification.

The invention relates to fuse plugs, and has as an object the provision of a fuse plug provided with a plurality of fusible elements which may be successively brought into use.

A further object of the invention is the provision of a multiple fuse plug of great simplicity.

A further object of the invention is the provision of a multiple fuse plug provided with a minimum number of parts, and which may be readily assembled.

Further objects of the invention will appear from the following description when read in connection with the accompanying drawings, wherein:

Fig. 1 is an end view partly broken away. i

Fig. 2 is a central section on line 22 of Fig. 1.

Fig. 3 is a transverse section on line 3-3 of Fig. 2, and

Fig. 4 is a detail vertical section on line 4-4 of Fig. 1.

As shown, the device comprises a body 10 of insulating material, a portion of its outer wall being formed into spiral corrugations to provide a screw thread and having a metal shell 11 closely fitted thereto. The plug thus provided is adapted to screw into a screw socket in the manner common to devices of this character. the shell 11 male lug electrical contact with the wall of the socket.

Mounted in longitudinal passages 12, in the body 10, there are shown fusible elements 13, one end of each of which is secured in electrical contact with the shell 11 as by soldering. The upper end of each fusible element 13 is shown as secured to a plate 14, each plate housed in a depression 15 in the upper surface of the plug 10.

A central contact for the plug is provided by the end of a rod 16, revolubly mounted in the plug 10, which plug is retained there on as by means of the enlarged head 17 and washer 18. The head 17 is adapted to make contact with a central contact of a socket in the well known manner.

'lo'provide electrical connection between the rod 16 and the fusible elements 13, there is shown a plate 19 permanently assembled with the rod 16. This assembly may be accomplished by providing a reduced end upon the rod 10, which passes through av central perforation in the plate 19. and the projecting end of the rod is then headed as shown at 20.

Connection between the plate 19 and a chosen plate 14 may be provided by means of a tongue 21, struck downwardly from the material of the plate 19. The plate 19 is preferably formed of material such as spring brass and therefore when the disklike head 22 of the plug is revolved, carrying with it the plate 19, the tongue 21 will be pressed out of one depression, and, upon further revolution, will spring into contact with the next plate 14 of the series.

The disk 22 is shown as rigidly secured to the plate 19 during the assembly of the device. This may be accomplished in any desirable manner, but it is preferred to form the head 22 of initially plastic material and to mold the plate 19 thereinto, and upturned margin 23 of the plate being shown for this purpose.

Obviously, other forms of anchorage to the disk 22 may be substituted therefor.

In the manufacture of the device, it is only necessary to assemble the plate 19 with the rod 16 prior to formation of the disk 22 with the assembled rod and disk permanent-ly secured thereto during its manufacture. The assembly of the elements 13 with the plates 14, and their insertion in the perforations 12, is a simple matter after which the elements may be soldered to the shell 11. The disk 22 and rod 16 is then assembled with the plug 10, thus constituting the entire assembly of the device.

To enable the user to determine the set ting of the device, numerals are shown upon the upper portion of the body 10, as at 24, and an opening 25 is provided in the disk 22 for observation thereof. If the plug be set at numeral 1 when first placed in use, the user will be sure, when element 6 fails, that the plug is exhausted, when a new plug may be substituted as in the single form of plug now in use.

Because of the compactness of the device, the multiple plug of the invention may be freely substituted in any location where the mounted in said singlefiotmnof l new thus connection it? v a obviating a serioigfifiztion to other forms dlsk-hk'e he adgo msu in ten a of which I am aware. metallic disk secured to a surface of said of multiple fuse plug In "tnals,- to- "dimwhich" pl ug has failed, all the plu in a box-maybealevolmd one numeral, an when the motion of the disk is found to reestablish a circuit, the plugs which have been ,needlessly. disturbed may have the revolution of the disk 22'threof completed to bring them back to the numerahwhich wasshowi at the beginning oi-theto ration where y to not over- 100k a good usible element.

Akusermay. readily test out a plug upon purchase by inseruing the same in a socket andtpassing each of the fusible elements in review before placing he plug :into service.

Minor changes may e made 1n the hysicalembodiment of-the invention without departing from. .the spirit thereof.

I claim:

1. A multiple -fuse lplugv. comprising 7 in combinatiomaa body.- oi lnsula material having. a plurality pf longitudina passages concentrically. ,arranged, and ,a depresslon about one oi-the openings; of each passage, a metallic-(shell mounts on the surface of saidtbody a plaralityuof fusible elements passages, each in electrical contact .with said -.shell,.i a contact plate seated :-in each depression and tin electrical head -a coudmtmeamwm iing frow saidimetallic disk ion in i the body and projecting therefrom to providea central plug contact, a spring finger struck from the material of and disk and adapted to enter saiiftlcpressions upon revo- 40 lution of the head to place the contact lates a in electrical connection cond 0W 2. A multiple fuse lug eemprising, combination abedyo insulating ma .hav-ing confentrical y arran "longitu A passage a iafcent its ,ri" cry, a threaded metallic she lniinulted on body, a fusible elementiin eachass electrical connection with con j y plates carriedjby said-body connection with the re I 3 ments, a disk-like h "a'metalhdplw having a deflected said head to secure thelate permanent! thereto,- a conductor -ri 1,51 secured. plate journaled in saidtree-cave: ution and projecting there bin to a central plug 'contaet,"a l finglr struck from the material'oi ed to make successive cqntact-;with"said Ill plates upon revolution .of the head.

ANTON"GO.. MWNN. 

